Mr. Edvinas Aleksandravicius Profile

Edvinas Aleksandravicius

at Vilnius Univ

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Author

Publications (4)

Proceedings Article | 20 June 2024 Presentation + Paper

Suppression of filamentation by photonic crystals

Edvinas Aleksandravičius, Darius Gailevičius, Audrius Dubietis, Kęstutis Staliūnas

Proceedings Volume 13004, 1300409 (2024) https://doi.org/10.1117/12.3022493

KEYWORDS: Photonic crystals, Fabrication, Bessel beams, Axicons, Dispersion, Modulation, Refractive index, Beam propagation method, Wave propagation, Telescopes

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Proceedings Article | 30 May 2022 Poster

Super-collimation with axisymmetric photonics

Darius Gailevičius, Indre Meskelaite, Edvinas Aleksandravicius, Martynas Peckus, Lina Grineviciute, Victor Taranenko, Kestutis Staliunas

Proceedings Volume PC12130, PC121301O (2022) https://doi.org/10.1117/12.2622113

KEYWORDS: Photonics, Near field optics, Diffraction, Photonic crystals, Near field, Diffraction gratings, Resonators, Microsystems, Materials processing, Collimators

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Proceedings Article | 26 May 2022 Presentation + Paper

Photonic crystals for suppression of filamentation

Edvinas Aleksandravičius, Darius Gailevičius, Audrius Dubietis, Kęstutis Staliūnas

Proceedings Volume 12143, 121430B (2022) https://doi.org/10.1117/12.2621487

KEYWORDS: Photonic crystals, Dispersion, Bessel beams, Refractive index, Modulation, Beam propagation method, Numerical simulations, Wave propagation

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Proceedings Article | 31 March 2020 Presentation

Preparation of 3D glass ceramic micro-/nanostructures by combining laser nanolithography with calcination (Conference Presentation)

Greta Merkininkaitė, Edvinas Aleksandravičius, Darius Gailevicius, Simonas Varapnickas, Mangirdas Malinauskas, Simas Šakirzanovas

Proceedings Volume 11349, 113490E (2020) https://doi.org/10.1117/12.2555838

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Ceramics play an important role in today’s science and industry as it can withstand immense thermal, mechanical, chemical and other hazards. In recent years, the interest in 3D printing micro- or even nano-structures out of ceramics has been growing rapidly. Therefore, direct laser writing by two photon polymerization together with calcination have been proved to be a powerful tool for the fabrication of fully 3D glass-ceramic objects in micro- and nano-scale [1]. However, producing such structures with unique properties at meso scale (features from nm to cm overall size) is one of the greatest challenges [2]. In order to overcome it the composition of the starting materials and as well as conditions of calcination have to be fully understood and enhanced. We synthesized a series of organic-inorganic polymer precursors via sol-gel method varying the molar ratio of silicon (Si) and zirconium (Zr) complexes (Si:Zr, where Si=9; 8; 7; 6; 5 and Zr=1; 2; 3; 4; 5) [3] and investigated 3D processing of these materials. The study shows that the “glassy” phase structures retain their shape without any distortion. Furthermore, calcination provides a route for the continuous size control and formation of a variety of phase transformation for free-form nano-/micro-objects. It is shown that due to the isotropic nature of the shrinkage during calcination fabricated 3D objects retain complex geometry. Nano-woodpiles, bulk-woodpile hybrids and full bulk structures are formed. The sizes of single features in these objects vary from 120 nm to 800 nm with overall size going to 30 µm. Finally, changes in focused ion beam machining rates between standard and calcinated materials are shown proving enhanced resiliency of the final product (up to 50%). [1] Gailevičius, D., et al., Additive-manufacturing of 3D glass-ceramics down to nanoscale resolution. Nanoscale Horiz.; 4, 647-651; (2019) [2] L. Jonusauskas, D. Gailevicius, S. Rekstyte, T. Baldacchini, S. Juodkazis, M. Malinauskas, Mesoscale Laser 3D Printing, Opt. Express 27 (11), 15205-15221 (2019) [3] Ovsianikov, A., et al., Ultra-Low Shrinkage Hybrid Photosensitive Material for Two-Photon Polymerization Microfabrication. ACS Nano; 2(11), 2257-2262; (2008)

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